Process of connecting filaments and feed-wires for electric incandescent lamps.



E. HANAMAN. PROGESS OP GONNEGTING PILAMENTS AND FEED WIRES FOR ELECTRICINGANDESGENT LAMPQ.

APPLIUATION FILED AUG. 28, 1909.

INVENTOR WlTNESSES:V

' 'UNITED STATES' PATENT OFFICE.

IRANZ HANAMAN, OIEYBUDAPEST, AUSTRIA-HUNGARY, ASSIGNOR TO GENERALELECTRIC-COMPANY, A CORPORATION 0F N YORK.

PROCESS 0F CONNECTING FILAMENTS .AND FEED-WIRES FOR ELECTRICINCANDESCENT A LAMPS.

Specication of Letters Patent.

Application filed August 28, 1909. Serial No. 515,034.

consists in a metal phosphid or mixtures of i `metal phosphids with eachother or with metals or oxids or hydro-oXids thereof. Ac-

cording to said invention the phosphids, etc.

are preferably mixed in a finely divided condition 'with water or othervolatile cement so as to form a paste which is applied to the joint orconnection and then dried and sintered or melted.

According to the present Iinvention I sinter or melt the connection' ina stream of gas so that any possible detrimental overheating ofthephosphid solder can be avoided by regulating the, gas current. -By thisprocess it is not necessary to work in a reducing or in lan indi'erentatmosphere, but the workcan be carried on in the open air. In carryingout the process I' prefer to f use the apparatus shown inthe accompanymphosphid paste.

ing drawing, which forms a part of the invention.

In the drawing 1 is a lamp frame with the metal filaments secured-inplace by the t 3 is an electrode attached to the insulated frame 2. y

4 is a second electrode which is movable and 5 is a tube surrounding theelectrode 4 through which, from a gasometer or the like, anysuitableincombustible' gasjcurrent (which may even be air) canbe blownupon the soldering knot to be formed. The lamp frame l with thefilaments pasted on is pressed lightly against the electrode 3 (with theleft hand) and then the electrode inclosed by the pipe 5 is made to bear(by the right hand) upon the knot to be melted, and a light arc isproduced, thus sintering ory melting the paste. By providing a stream ofgas through the pipe 5 the soldering lmot is immediately cooled ofi' vinan effective manner, so that it again vcools or solidies very quickly'after the electrode 4 is removed. l The process is particularlysuitable for soldering by means of metal phosphids which (like goldphosphid for instance) becomeeasily decomposed when heated to hightemperatures. Both the process and the apparatus, however, may be usedin connection with other soldering material.'

While I have described in detail one form of the present invention it isto be understood that I do not wish to be limited thereto, sincevariations may be made therein Without departing from the invention.

What I claim is l The process of making an electrical connection betweena filament and a leading-in wire which consists in forming at the jointa knot of lovsT melting soldering material which. isliable to becomedecomposed when heated to a high temperature, drawing an electric. areat the connection, and maintaining the temperature of the knot below thedecomposing point of such material by playing a stream of gas onthe saidknot.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

p FRANZ HANAMAN.

Witnesses: I j l Luo KRAUsE, MICHAEL ToMoR.

Patented July o, 1912.

